Re: [WIP]Vertical Clustered Index (columnar store extension) - take2 - Mailing list pgsql-hackers

Hi Timur.

On Thu, May 29, 2025 at 11:30 PM Timur Magomedov
<t.magomedov@postgrespro.ru> wrote:
>
> Hi Peter,
> I've noticed there are changes in Postgres code v4 patch that rollback
> the commit [1]. That commit optimizes TupleHashEntryData struct size
> and amount of memory allocations which improves performance (see
> discussion [2]).
> Can we use leave TupleHashEntryData as is and make new VCI-specific
> struct that contains TupleHashEntryData member and an additional
> pointer or make VCI use TupleHashEntryGetAdditional()?
>
> [1]
>
https://www.postgresql.org/message-id/attachment/174581/v9-0004-Remove-additional-pointer-from-TupleHashEntryData.patch
> [2]
> https://www.postgresql.org/message-id/flat/817d244237878cebdff0bc363718feaf49a1ea7d.camel%40j-davis.com

Thank you for noticing and reporting this!

It was not intentional to roll back changes to core PostgreSQL. These
VCI patches originated from an older forked source, so it seems this
reversion was inadvertently introduced during the rebasing process.

We’ll aim to correct this in a future patch.

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Kind Regards,
Peter Smith.
Fujitsu Australia